Spectres Raman de Basses Frequences de Cristaux de Derives Benzeniques Paradisubstitues: p‐Br2C6H4, p‐Br2C6D4, p‐BrClC6H4 et p‐ClC6H4. Étude du désordre dans le dérive p‐BrClC6H4

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Abstract
An assignment of the Raman active lattice modes in terms of factor group symmetry species and rotational vibrations is given for paradibromobenzene‐H4 and ‐D4, parabromochlorobenzene and parachloroiodobenzene. The analysis of the Raman spectra of mixed crystals of paradibromobenzene and paradichlorobenzene at 90K with 1 cm−1 resolution and the temperature dependence of the linewidths of the three librations are evidence for the static nature of the disorder in the unsymmetrical derivatives.